Historical clue formulations

• Most common vowel sounds in English — 2024-02-29
• Beginning and end of "America" — 2021-02-07
• Start and end of 3-Down, phonetically — 2013-07-31
• Ends of Alaska? — 2012-10-28
• They're unstressed — 2004-02-01
• Low-stress types — 1998-02-06